I had a similar problem a few months ago. My ABS light would come on under hard braking. I took the car to my local garage and he told me the code he could see related to an AC problem. Like you, I was confused as to what the AC had to do with the ABS.
Anyway, to make a long story short, he reset the computer, erasing the code and said if it happens again to bring it back. It did happen a couple of days later during a panic brake. This time I took it to the Ford dealer. It turned out to be my ABS anti-skid traction control something or other. They replaced the part (850.00) and the problem has not resurfaced. Unfortunately, I forgot to ask him if the light was linled somehow to the piece then changed.
By the way....the part and labor was covered under my warranty. I paid $50.00.
